A mirepoix (/mɪərˈpwɑː/ meer-PWAH; French: [miʁ.pwa]) is a flavor base made from diced vegetables cooked—usually with butter, oil, or other fat—for a long time on low heat without coloring or browning, as further cooking, often with the addition of tomato purée, creates a darkened brown mixture called pinçage. It is not sautéed or otherwise hard cooked, because the intention is to sweeten the ingredients rather than caramelize them. It is a long-standing cooking technique in French cuisine.